[Release-1.28] - Agent node IP not replaced with Tailscale VPN IP

[manuelbuil]

Backport fix for Agent node IP not replaced with Tailscale VPN IP

• Agent node IP not replaced with Tailscale VPN IP #10064

[VestigeJ]

##Environment Details
Reproduced using VERSION=v1.29.5+k3s1
Validated using COMMIT=7b8f0e1bfc1c70fa5a015503d12412f96fbd5133

Infrastructure

• Cloud

Node(s) CPU architecture, OS, and version:

Linux 5.14.21-150500.53-default x86_64 GNU/Linux
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP5"

Config.yaml:

node-external-ip: 1.1.1.31
server: https://1.1.1.61:6443
token: YOUR_TOKEN_HERE
vpn-auth-file: /etc/rancher/k3s/vpn

Reproduction

$ curl https://get.k3s.io --output install-"k3s".sh
$ sudo chmod +x install-"k3s".sh
$ sudo groupadd --system etcd && sudo useradd -s /sbin/nologin --system -g etcd etcd
$ sudo modprobe ip_vs_rr
$ sudo modprobe ip_vs_wrr
$ sudo modprobe ip_vs_sh
$ sudo printf "on_oovm.panic_on_oom=0 \nvm.overcommit_memory=1 \nkernel.panic=10 \nkernel.panic_ps=1 \nkernel.panic_on_oops=1 \n" > ~/90-kubelet.conf
$ sudo cp 90-kubelet.conf /etc/sysctl.d/
$ sudo systemctl restart systemd-sysctl
$ get_tailscale //function pasted below
$ sudo mkdir -p /etc/rancher/k3s
$ sudo vim /etc/rancher/k3s/vpn
$ cat /etc/rancher/k3s/vpn
$ COMMIT=7b8f0e1bfc1c70fa5a015503d12412f96fbd5133
$ sudo INSTALL_K3S_COMMIT=$COMMIT INSTALL_K3S_EXEC=agent ./install-k3s.sh

Results:

$ kgn

NAME               STATUS   ROLES                       AGE     VERSION                 INTERNAL-IP      EXTERNAL-IP      OS-IMAGE                              KERNEL-VERSION              CONTAINER-RUNTIME
ip-1-1-1-91        Ready    <none>                      6m59s   v1.28.10+k3s1           1.1.1.91         1.1.1.31      SUSE Linux Enterprise Server 15 SP5   5.14.21-150500.53-default   containerd://1.7.15-k3s1
ip-1-1-1-61        Ready    control-plane,etcd,master   7m40s   v1.28.10+k3s1           100.77.213.109   1.1.1.81      SUSE Linux Enterprise Server 15 SP5   5.14.21-150500.53-default   containerd://1.7.15-k3s1
ip-1-1-1-31        Ready    <none>                      6m58s   v1.28.10+k3s-7b8f0e1b   100.86.92.4      1.1.1.31      SUSE Linux Enterprise Server 15 SP5   5.14.21-150500.53-default   containerd://1.7.15-k3s1

get_tailscale() {
    curl -fsSL https://tailscale.com/install.sh -o install-ts.sh
    chmod +x install-ts.sh
    sudo ./install-ts.sh
}